later, president obama speaks about the impornce of investing in science education. >> she was close to being broken by the time she went to the white house. >> this is the earliest existing house. they lived here in the 1830's and 18 40's. >> she was educated and taught school. >> she would work. the north and south fought all over the civil war. it changed hands 26 times. they did have domestic help. >> it was used as a hospital, it was used as a place to stay and it was destroyed. >> aleezeh liza wasn't able to get out much. >> she brought home many gifts. >> this is the room she returned to. >> she is obscure. who he needed. >> abraham lincoln's assassination weeks after his second inaugural shocked a war-raffvadged nation. johnson's wife eliza was 54 years old when she was thrust into the role as first lady. he navigated the end of the civil war, reconstruction in the south and his own impeachment. this week on "first ladies, the life and times of eliza johnson." . we learn more, let me introduce you to our two guests. jacqueline burger is in the midst of a biography collection